What a Binding produced by Bindable looks like

Bindable produces Binding.txt

▿ SwiftUI.Binding<Swift.Bool>
  ▿ transaction: SwiftUI.Transaction
    ▿ plist: []
      - elements: nil
  ▿ location: SwiftUI.LocationBox<SwiftUI.Binding<Swift.Bool>.(unknown context at $1c460b9d4).ScopedLocation> #0
    - super: SwiftUI.AnyLocation<Swift.Bool>
      - super: SwiftUI.AnyLocationBase
    ▿ location: SwiftUI.Binding<Swift.Bool>.(unknown context at $1c460b9d4).ScopedLocation
      ▿ base: SwiftUI.LocationBox<SwiftUI.(unknown context at $1c3c342f4).ObjectLocation<TestGroup.Option, Swift.Bool>> #1
        - super: SwiftUI.AnyLocation<Swift.Bool>
          - super: SwiftUI.AnyLocationBase
        ▿ location: SwiftUI.(unknown context at $1c3c342f4).ObjectLocation<TestGroup.Option, Swift.Bool>
          ▿ base: TestGroup.Option #2
            - title: "A"
            - _selected: false
            ▿ _$observationRegistrar: Observation.ObservationRegistrar
              ▿ extent: Observation.ObservationRegistrar.(unknown context at $2251b3224).Extent #3
                ▿ context: Observation.ObservationRegistrar.Context
                  ▿ state: Observation._ManagedCriticalState<Observation.ObservationRegistrar.(unknown context at $2251b32f4).State>
                    - buffer: Observation._ManagedCriticalState<Observation.ObservationRegistrar.(unknown context at $2251b32f4).State>.(unknown context at $2251b3140).LockedBuffer #4
                      ▿ super: Swift.ManagedBuffer<Observation.ObservationRegistrar.(unknown context at $2251b32f4).State, Swift.UnsafeRawPointer>
                        ▿ header: Observation.ObservationRegistrar.(unknown context at $2251b32f4).State
                          - id: 2
                          ▿ observations: 2 key/value pairs
                            ▿ (2 elements)
                              - key: 1
                              ▿ value: Observation.ObservationRegistrar.(unknown context at $2251b32f4).State.Observation
                                ▿ kind: Observation.ObservationRegistrar.(unknown context at $2251b32f4).State.ObservationKind.willSetTracking
                                  - willSetTracking: (Function)
                                ▿ properties: 1 member
                                  - \Option.selected #5
                                    - super: Swift.WritableKeyPath<TestGroup.Option, Swift.Bool>
                                      - super: Swift.KeyPath<TestGroup.Option, Swift.Bool>
                                        - super: Swift.PartialKeyPath<TestGroup.Option>
                                          ▿ super: Swift.AnyKeyPath
                                            - _kvcKeyPathStringPtr: nil
                            ▿ (2 elements)
                              - key: 0
                              ▿ value: Observation.ObservationRegistrar.(unknown context at $2251b32f4).State.Observation
                                ▿ kind: Observation.ObservationRegistrar.(unknown context at $2251b32f4).State.ObservationKind.willSetTracking
                                  - willSetTracking: (Function)
                                ▿ properties: 1 member
                                  - \Option.selected #5
                          ▿ lookups: 1 key/value pair
                            ▿ (2 elements)
                              - key: \Option.selected #5
                              ▿ value: 2 members
                                - 0
                                - 1
          - keyPath: \Option.selected #5
          - isolation: nil
        ▿ _cache: SwiftUI.AtomicBox<SwiftUI.LocationProjectionCache>
          - buffer: SwiftUI.(unknown context at $1c461a7a8).AtomicBuffer<SwiftUI.LocationProjectionCache> #6
            ▿ super: Swift.ManagedBuffer<__C.os_unfair_lock_s, SwiftUI.LocationProjectionCache>
              ▿ header: __C.os_unfair_lock_s
                - _os_unfair_lock_opaque: 0
      - wasRead: true
    ▿ _cache: SwiftUI.AtomicBox<SwiftUI.LocationProjectionCache>
      - buffer: SwiftUI.(unknown context at $1c461a7a8).AtomicBuffer<SwiftUI.LocationProjectionCache> #7
        ▿ super: Swift.ManagedBuffer<__C.os_unfair_lock_s, SwiftUI.LocationProjectionCache>
          ▿ header: __C.os_unfair_lock_s
            - _os_unfair_lock_opaque: 0
  - _value: false

Things to note, a Binding has:

• a transaction
• the (I think last, right before DynamicElement.update()) _value
• a backing storage, which can be a set of things, here we see:
  • something that seems to be specific to Observation
  • there is also a backing which is the usual setter/getter closures
  • and there are others for State and ObservableObject I think (though those might be abstracted out using AnyLocation, a layer below)